Annotation of src/usr.bin/apply/apply.c, Revision 1.12
1.12 ! deraadt 1: /* $OpenBSD: apply.c,v 1.11 2002/02/16 21:27:43 millert Exp $ */
1.1 deraadt 2: /* $NetBSD: apply.c,v 1.3 1995/03/25 03:38:23 glass Exp $ */
3:
4: /*-
5: * Copyright (c) 1994
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Jan-Simon Pendry.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
19: * 3. All advertising materials mentioning features or use of this software
20: * must display the following acknowledgement:
21: * This product includes software developed by the University of
22: * California, Berkeley and its contributors.
23: * 4. Neither the name of the University nor the names of its contributors
24: * may be used to endorse or promote products derived from this software
25: * without specific prior written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37: * SUCH DAMAGE.
38: */
39:
40: #ifndef lint
41: #if 0
42: static char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94";
43: #else
1.12 ! deraadt 44: static char rcsid[] = "$OpenBSD: apply.c,v 1.11 2002/02/16 21:27:43 millert Exp $";
1.1 deraadt 45: #endif
46: #endif /* not lint */
47:
48: #include <sys/wait.h>
49:
50: #include <ctype.h>
51: #include <err.h>
52: #include <paths.h>
53: #include <signal.h>
54: #include <stdio.h>
55: #include <stdlib.h>
56: #include <string.h>
57: #include <unistd.h>
58:
1.11 millert 59: void usage(void);
60: int system(const char *);
1.1 deraadt 61:
62: int
63: main(argc, argv)
64: int argc;
65: char *argv[];
66: {
67: int ch, clen, debug, i, l, magic, n, nargs, rval;
68: char *c, *cmd, *p, *q;
1.12 ! deraadt 69: size_t len;
1.1 deraadt 70:
71: debug = 0;
72: magic = '%'; /* Default magic char is `%'. */
73: nargs = -1;
1.3 millert 74: while ((ch = getopt(argc, argv, "a:d0123456789")) != -1)
1.1 deraadt 75: switch (ch) {
76: case 'a':
77: if (optarg[1] != '\0')
78: errx(1,
79: "illegal magic character specification.");
80: magic = optarg[0];
81: break;
82: case 'd':
83: debug = 1;
84: break;
85: case '0': case '1': case '2': case '3': case '4':
86: case '5': case '6': case '7': case '8': case '9':
87: if (nargs != -1)
88: errx(1,
89: "only one -# argument may be specified.");
90: nargs = optopt - '0';
91: break;
92: default:
93: usage();
94: }
95: argc -= optind;
96: argv += optind;
97:
98: if (argc < 2)
99: usage();
100:
101: /*
102: * The command to run is argv[0], and the args are argv[1..].
103: * Look for %digit references in the command, remembering the
104: * largest one.
105: */
106: for (n = 0, p = argv[0]; *p != '\0'; ++p)
107: if (p[0] == magic && isdigit(p[1]) && p[1] != '0') {
108: ++p;
109: if (p[0] - '0' > n)
110: n = p[0] - '0';
111: }
112:
113: /*
114: * If there were any %digit references, then use those, otherwise
115: * build a new command string with sufficient %digit references at
116: * the end to consume (nargs) arguments each time round the loop.
117: * Allocate enough space to hold the maximum command.
118: */
1.12 ! deraadt 119: len = sizeof("exec ") - 1 +
! 120: strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1;
! 121: if ((cmd = malloc(len)) == NULL)
1.1 deraadt 122: err(1, NULL);
123:
124: if (n == 0) {
1.12 ! deraadt 125: size_t l;
! 126:
1.1 deraadt 127: /* If nargs not set, default to a single argument. */
128: if (nargs == -1)
129: nargs = 1;
130:
1.12 ! deraadt 131: l = snprintf(cmd, len, "exec %s", argv[0]);
! 132: if (l >= len)
! 133: err(1, "snprintf");
! 134: len -= l;
! 135: p = cmd + l;
! 136:
! 137: for (i = 1; i <= nargs; i++) {
! 138: l = snprintf(p, len, " %c%d", magic, i);
! 139: if (l >= len)
! 140: err(1, "snprintf");
! 141: len -= l;
! 142: p += l;
! 143: }
1.1 deraadt 144:
145: /*
146: * If nargs set to the special value 0, eat a single
147: * argument for each command execution.
148: */
149: if (nargs == 0)
150: nargs = 1;
151: } else {
1.12 ! deraadt 152: (void)snprintf(cmd, len, "exec %s", argv[0]);
1.1 deraadt 153: nargs = n;
154: }
155:
156: /*
157: * Grab some space in which to build the command. Allocate
158: * as necessary later, but no reason to build it up slowly
159: * for the normal case.
160: */
161: if ((c = malloc(clen = 1024)) == NULL)
162: err(1, NULL);
163:
164: /*
165: * (argc) and (argv) are still offset by one to make it simpler to
166: * expand %digit references. At the end of the loop check for (argc)
167: * equals 1 means that all the (argv) has been consumed.
168: */
169: for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) {
170: /*
171: * Find a max value for the command length, and ensure
172: * there's enough space to build it.
173: */
174: for (l = strlen(cmd), i = 0; i < nargs; i++)
1.6 deraadt 175: l += strlen(argv[i+1]);
1.1 deraadt 176: if (l > clen && (c = realloc(c, clen = l)) == NULL)
177: err(1, NULL);
178:
179: /* Expand command argv references. */
180: for (p = cmd, q = c; *p != '\0'; ++p)
1.12 ! deraadt 181: if (p[0] == magic && isdigit(p[1]) && p[1] != '0') {
! 182: sprintf(q, "%s", argv[(++p)[0] - '0']);
! 183: q += strlen(q);
! 184: } else
1.1 deraadt 185: *q++ = *p;
186:
187: /* Terminate the command string. */
188: *q = '\0';
189:
190: /* Run the command. */
191: if (debug)
192: (void)printf("%s\n", c);
193: else
194: if (system(c))
195: rval = 1;
196: }
197:
198: if (argc != 1)
199: errx(1, "expecting additional argument%s after \"%s\"",
200: (nargs - argc) ? "s" : "", argv[argc - 1]);
201: exit(rval);
202: }
203:
204: /*
205: * system --
206: * Private version of system(3). Use the user's SHELL environment
207: * variable as the shell to execute.
208: */
209: int
210: system(command)
211: const char *command;
212: {
213: static char *name, *shell;
214: pid_t pid;
1.10 millert 215: int pstat;
216: sigset_t mask, omask;
1.1 deraadt 217: sig_t intsave, quitsave;
218:
219: if (shell == NULL) {
220: if ((shell = getenv("SHELL")) == NULL)
221: shell = _PATH_BSHELL;
222: if ((name = strrchr(shell, '/')) == NULL)
223: name = shell;
224: else
225: ++name;
226: }
227: if (!command) /* just checking... */
228: return(1);
229:
1.10 millert 230: sigemptyset(&mask);
231: sigaddset(&mask, SIGCHLD);
232: sigprocmask(SIG_BLOCK, &mask, &omask);
1.4 bitblt 233: switch(pid = fork()) {
1.1 deraadt 234: case -1: /* error */
235: err(1, "fork");
236: case 0: /* child */
1.10 millert 237: sigprocmask(SIG_SETMASK, &omask, NULL);
1.9 deraadt 238: execl(shell, name, "-c", command, (char *)NULL);
1.1 deraadt 239: err(1, "%s", shell);
240: }
241: intsave = signal(SIGINT, SIG_IGN);
242: quitsave = signal(SIGQUIT, SIG_IGN);
1.5 deraadt 243: pid = waitpid(pid, &pstat, 0);
1.10 millert 244: sigprocmask(SIG_SETMASK, &omask, NULL);
1.1 deraadt 245: (void)signal(SIGINT, intsave);
246: (void)signal(SIGQUIT, quitsave);
1.5 deraadt 247: return(pid == -1 ? -1 : pstat);
1.1 deraadt 248: }
249:
250: void
251: usage()
252: {
253: (void)fprintf(stderr,
1.8 aaron 254: "usage: apply [-#] [-a magic] [-d] command argument [...]\n");
1.1 deraadt 255: exit(1);
256: }
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